title: Acquisition of Ly49 receptor expression by developing natural killer cells.
abstract: The formation of the repertoire of mouse natural killer (NK) cell receptors for major histocompatibility complex (MHC) class I molecules was investigated by determining the developmental pattern of Ly49 receptor expression. During the first days after birth, few or no splenic NK cells express Ly49A, Ly49C, Ly49G2, or Ly49I receptors. The proportion of Ly49+ splenic NK cells gradually rises to adult levels during the first 6-8 wk of life. The appearance of appreciable numbers of splenic Ly49+ NK cells coincides with the appearance of NK activity at 3-4 wk. After in vivo transfer, NK cells not expressing specific Ly49 receptors can give rise to NK cells that do, and cells expressing one of these four Ly49 receptors can give rise to cells expressing others. Once initiated, expression of a Ly49 receptor is stable for at least 10 d after in vivo transfer. Hence, initiation of Ly49 receptor expression occurs successively. Interestingly, expression of one of the receptors tested, Ly49A, did not occur after in vivo transfer of Ly49A- cells. One possible explanation for these data is that the order of Ly49 receptor expression by NK cells is nonrandom. The results provide a framework for evaluating models of NK cell repertoire formation, and how the repertoire is molded by host class I MHC molecules.
authors.affiliation: Department of Molecular and Cell Biology and the Cancer Research Laboratory, University of California at Berkeley, Berkeley, California 94720, USA.
authors.forename: J R
authors.initials: JR
authors.lastname: Dorfman
authors.forename: D H
authors.initials: DH
authors.lastname: Raulet
mesh_terms: D000818:Animals; D000941:Antigens / Q000096:biosynthesis; D000950:Antigens, Ly; D000954:Antigens, Surface / Q000096:biosynthesis*; D002454:Cell Differentiation; D002478:Cells, Cultured; D018507:Gene Expression Regulation, Developmental; D007694:Killer Cells, Natural / Q000166:cytology / Q000378:metabolism*; D037181:Lectins, C-Type; D008562:Membrane Glycoproteins / Q000096:biosynthesis* / Q000235:genetics; D051379:Mice; D008810:Mice, Inbred C57BL; D055650:NK Cell Lectin-Like Receptor Subfamily A; D055651:NK Cell Lectin-Like Receptor Subfamily B; D014176:Protein Biosynthesis; D011506:Proteins; D011971:Receptors, Immunologic / Q000096:biosynthesis*; D055630:Receptors, NK Cell Lectin-Like; D013154:Spleen / Q000166:cytology / Q000196:embryology
chemical_list: D000941:Antigens; D000950:Antigens, Ly; D000954:Antigens, Surface; C527088:Klra1 protein, mouse; C527091:Klra3 protein, mouse; D037181:Lectins, C-Type; D008562:Membrane Glycoproteins; D055650:NK Cell Lectin-Like Receptor Subfamily A; D055651:NK Cell Lectin-Like Receptor Subfamily B; D011506:Proteins; D011971:Receptors, Immunologic; D055630:Receptors, NK Cell Lectin-Like